Bug 20934: (QA follow-up) Fix showing number of records in checkout history

Bug 20934: (QA follow-up) Fix showing number of records in checkout history

Test plan:
0) Do not apply this patch
1) Go to biblio checkout history page (issuehistory.pl)
2) You'll see something like "Checked out ARRAY(0xf830378) times"
3) Apply this patch
4) Now you should see number of checkout history records

Signed-off-by: Josef Moravec <josef.moravec@gmail.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>
(cherry picked from commit 64c596b13c82a2942792d975363a0d689182d627)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>